arch/arm/include/asm/trusted_foundations.h

   1 /*
   2  * Copyright (c) 2013, NVIDIA Corporation.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  */
  14
  15 /*
  16  * Support for the Trusted Foundations secure monitor.
  17  *
  18  * Trusted Foundation comes active on some ARM consumer devices (most
  19  * Tegra-based devices sold on the market are concerned). Such devices can only
  20  * perform some basic operations, like setting the CPU reset vector, through
  21  * SMC calls to the secure monitor. The calls are completely specific to
  22  * Trusted Foundations, and do *not* follow the SMC calling convention or the
  23  * PSCI standard.
  24  */
  25
  26 #ifndef __ASM_ARM_TRUSTED_FOUNDATIONS_H
  27 #define __ASM_ARM_TRUSTED_FOUNDATIONS_H
  28
  29 #include <linux/kconfig.h>
  30 #include <linux/printk.h>
  31 #include <linux/bug.h>
  32 #include <linux/of.h>
  33
  34 struct trusted_foundations_platform_data {
  35         unsigned int version_major;
  36         unsigned int version_minor;
  37 };
  38
  39 #if IS_ENABLED(CONFIG_TRUSTED_FOUNDATIONS)
  40
  41 void register_trusted_foundations(struct trusted_foundations_platform_data *pd);
  42 void of_register_trusted_foundations(void);
  43
  44 #else /* CONFIG_TRUSTED_FOUNDATIONS */
  45
  46 static inline void register_trusted_foundations(
  47                                    struct trusted_foundations_platform_data *pd)
  48 {
  49         /*
  50          * If we try to register TF, this means the system needs it to continue.
  51          * Its absence if thus a fatal error.
  52          */
  53         panic("No support for Trusted Foundations, stopping...\n");
  54 }
  55
  56 static inline void of_register_trusted_foundations(void)
  57 {
  58         /*
  59          * If we find the target should enable TF but does not support it,
  60          * fail as the system won't be able to do much anyway
  61          */
  62         if (of_find_compatible_node(NULL, NULL, "tl,trusted-foundations"))
  63                 register_trusted_foundations(NULL);
  64 }
  65 #endif /* CONFIG_TRUSTED_FOUNDATIONS */
  66
  67 #endif